JP4689110B2 - Multipole circuit breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multipole circuit breaker, and more particularly to a holding member for the switching contactor.
[0002]
[Prior art]
An example of a conventional circuit breaker is shown in FIG. The circuit breaker includes a molded insulator case 100, a main circuit conductive portion including an open / close contact accommodated in the molded insulator case 100, and an open / close mechanism for operating the open / close contact.
[0003]
The main circuit conductive portion is rotatably held by a shaft 104 on a stationary contact 102 and contact holder 103 having one end forming a terminal and a contact 101 at the other end, and having a contact 105 at one end and the other end. A movable contact 107 having a flexible lead 106, a conductor 109 for an overcurrent tripping device 108, and the other terminal 110 are sequentially connected from the other end of the flexible lead 106 via a relay terminal.
[0004]
The opening / closing mechanism is rotatably held by a shaft 114 on a trip lever 112 that is rotatably held by a shaft 111, a latch mechanism 113 that prevents the trip lever 112 from rotating counterclockwise, and a trip lever 112. The link plate 115, the link plate 116 rotatably supported on the contact holder 103 by the shaft 104, the shaft 117 for rotatably connecting the link plate 115 and the link plate 116 to each other, and the handle rotating about the shaft 118. 119 and a spring 120 provided between the handle 119 and the shaft 117.
[0005]
FIG. 6 shows a closed state of the circuit breaker. The shaft 117 is urged to the left by the force of the spring 120, the link plate 115 and the link plate 116 are in a substantially straight state, and the contact holder 103 is pivoted. It is in a state of rotating counterclockwise about 121. The movable contact 107 is rotated counterclockwise by the force of the spring 122 so that the contact 101 and the contact 105 are in contact with each other. When the handle 119 is rotated clockwise in this closed state and the action line of the force of the spring 120 exceeds the shaft 114 from the left to the right, the shaft 117 is urged to the right by the force of the spring 120 and the link plate 115 The link plate 116 is folded in a reverse shape. For this reason, the contact holder 103 is rotated in the clockwise direction together with the movable contact 107, so that the contact 101 and the contact 105 are opened. When the handle 119 is rotated counterclockwise from the open circuit state, the link plate 115 and the link plate 116 are substantially in a straight line, and the closed circuit state of FIG. 6 is obtained. Further, when an overcurrent flows and the overcurrent tripping device 108 operates, the latch of the latch mechanism 113 is disengaged and the trip lever 112 rotates counterclockwise. By this rotation, the link plate 115 and the link plate 116 are displaced upward, the contact holder 103 rotates in the clockwise direction, and the contact 101 and the contact 105 are separated from each other.
[0006]
Some circuit breakers include a multi-pole type having one switching mechanism and a plurality of main circuit conductive parts insulated from each other. This multipolar type circuit breaker can simultaneously open and close a plurality of switching contacts by operating a switching mechanism. For example, in a three-pole circuit breaker, an opening / closing mechanism is provided at the central pole, the conductive portion of the central pole is directly connected to the opening / closing mechanism, and the conductive portions of both end poles are connected to the central pole by an insulating crossbar 123. Many of them are structured.
[0007]
Such a circuit breaker spring 122 or spring 120 is selected to have a large acting force, and a large electromagnetic repulsive force acts when a short-circuit current flows. Therefore, the contact holder 103 and the crossbar 123 are large. A member that can withstand mechanical force is used. For this reason, an iron plate has been used as the contact holder 103 of this conventional circuit breaker. Further, as the cross bar 123, a thermosetting synthetic resin insulator is wound around an iron mandrel in a rolled sushi shape and heat and pressure are applied, and a member having insulation and strength is used. Thus, the contact holders 103 of each pole are crimped.
[0008]
[Problems to be solved by the invention]
In the conventional circuit breaker, the manufacture of the crossbar-123 is complicated, and if the caulking force is too large when the crossbar 123 as an insulator is caulked to the contact holder 103, the crossbar 123 is damaged and is small. Since it is easy to loosen too much, there is a problem that the management of dimensions and work management are complicated.
[0009]
Accordingly, it is an object of the present invention to provide a circuit breaker having a cross bar and a contact holder member that are simple to manufacture and have high strength.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of claim 1 is one of an open / close contact provided in each pole, a contact holder holding the open / close contact, a cross bar connecting the contact holder, and a contact holder. This is a multi-pole circuit breaker that is connected to the pole portion and has a common switching mechanism for rotating the crossbar. In this multipole circuit breaker, the crossbar and the contact holder are integrally molded members that are integrally molded by placing an insulating material so as to cover the mandrel, and the mandrel is attached to the crossbar part. A common mandrel over the arranged poles and an arm mandrel provided integrally with the common mandrel and arranged in the contact holder portion . The arm mandrel is disposed at least on the pole of the contact holder to which the opening / closing mechanism is coupled, and the opening / closing mechanism is coupled to the arm mandrel portion of the pole.
[0011]
With such a configuration, since the crossbar portion and the contact holder portion are reinforced by the common mandrel and the arm mandrel, respectively, the mechanical strength is strong. Moreover, although both the cores may be manufactured as a single body from the beginning, both the cores manufactured separately may be integrated, and the integrated processing is easy because both are metal. Furthermore, since the crossbar portion and the contact holder portion are integrally molded using the insulating material as the covering material with both the cores as the cores, the molding process is easy. As a result, it is easy and reliable to cover both the cores with the insulator, so that the insulation performance is improved. In addition, this insulator may be formed with protrusions or the like that engage with holes in which the contact holder is rotatably held at both ends.
[0013]
Further , according to this configuration, the arm mandrel is disposed at the pole connected to the opening / closing mechanism, which requires at least more strength, and the opening / closing mechanism is coupled at the portion of the arm mandrel. Can withstand a large opening and closing force. Here, the arm mandrel is arranged so as to bear a force acting on the connecting portion, such as a configuration in which the arm mandrel is connected to the opening / closing mechanism in a hole formed in the arm mandrel. Means that.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention will be described in the example of the three-pole circuit breaker shown in FIGS.
[0015]
1 to 3, a contact holding member 1 of this circuit breaker is a molded insulating member in which a crossbar portion and a contact holder portion are integrally molded. This contact holding member 1 has a common core 2 having a U-shaped cross section that crosses each pole inside the crossbar portion, and each metal plate is processed inside the contact holder portion of each pole. The cross section has U-shaped arm mandrels 3, 4, and 5. The arm cores 3, 4, and 5 are caulked to the common core metal 2, and the central arm core 4 has a hole 4 a formed with ribs and is longer than the end cores 3 and 5. The contactor holding member 1 includes the entire mandrel including the inner wall of the hole 4a of the arm mandrel 4 covered with an insulator, and cylindrical shafts 1a are formed at both ends of the crossbar portion.
[0016]
4 and 5, this circuit breaker has a main circuit conductive portion provided for each pole housed in a case 6 made of molded insulator and an opening / closing mechanism provided at the center pole. ing. The main circuit conductive portion has a fixed contact 8 having a terminal 8a formed at one end and an opening / closing contact 7 attached to the other end, and an opening / closing contact 9 that contacts and separates the opening / closing contact 7 at one end, and is flexible at the other end. The movable contact 11 having the lead 10, the relay terminal 12 sequentially connected from the other end of the flexible lead 10, and the other terminal member 13, part of which is illustrated. The movable contact 11 of each pole is rotatably mounted by a shaft 14 inserted into a hole 1b formed in the contact holder portion of each pole of the contact holding member 1, and is attached counterclockwise by a contact pressure spring 15. It is energized.
[0017]
The opening / closing mechanism includes a frame 16, a handle lever 17 whose cross section is bent in a U shape, and whose leg arc-shaped end 17 a slides on the arc-shaped concave portion 16 a of the frame 16 and rotates, and a shaft provided on the frame 16. A trip lever 19 that is rotatably held by the lever 18, a latch mechanism 20 that prevents the trip lever 19 from rotating counterclockwise, an upper link plate 22 that is rotatably held by the trip lever 19 by the shaft 21, and a contact by the shaft 23 A lower link plate 24 rotatably held by the child holding member 1, a shaft 25 for rotatably connecting the upper link plate 22 and the lower link plate 24, a spring 26 provided between the handle lever 17 and the shaft 25, and a handle A handle 27 made of a molded insulator is attached to the lever 17 and protrudes from the opening of the case 6. The contact holding member 1 is rotatably held with a cylindrical shaft 1a fitted in a bearing (not shown) of the case 6.
[0018]
Referring to FIG. 4 showing the closed state, the handle 27 of the circuit breaker is in the closed position, and the shaft 25 is displaced leftward by the force of the spring 26. In this state, the upper link plate 22 and the lower link plate 24 are in a substantially straight line state, and the contact holding member 1 rotates counterclockwise together with the movable contact 11, so that the contact pressure spring 15 can The switching contact 9 is in contact.
[0019]
When the handle 27 is rotated clockwise in the closed state, the action line of the force of the spring 26 moves the shaft 21 from the left to the right. By this movement, the upper link plate 22 and the lower link plate 24 are bent in an inverted shape, the contact holding member 1 is rotated clockwise together with the movable contact 11, and the open / close contact 7 and the open / close contact 9 are separated. It becomes a state.
Furthermore, in the closed state, when an overcurrent flows and an overcurrent tripping device (not shown) operates, the engagement between the trip lever 19 and the latch mechanism 20 is released, and the trip lever 19 rotates counterclockwise. By this rotation, the contact holding member 1 is rotated in the clockwise direction together with the movable contact 11 via the upper link plate 22 and the lower link plate 24, and a trip state in which the open / close contact 7 and the open / close contact 9 are separated is brought about.
[0020]
The shaft 23 that connects the switching mechanism of the circuit breaker and the contact holding member 1 is inserted into a hole 1c formed by a molded insulating member that covers the inner wall of the hole 4a of the central arm 4. . For this reason, the strength of the contact holder portion at the center pole is sufficient to operate the movable contact 11 with two poles at both ends in conjunction with each other. Further, the contact holder holder portion of the two contacts on both ends of the contact holding member 1 has a high strength because the arm mandrel 3 and the arm mandrel 5 are located near the base. In addition, since the hole 1b of the contact holding member 1 through which the shaft 14 holding the movable contact 11 of each pole is inserted is formed at a position away from the arm cores 3, 4, and 5, each pole is insulated from each other. ing.
[0021]
Although the embodiment of the present invention has been described above, the embodiment of the present invention disclosed above is merely an example, and the scope of the present invention is limited to the embodiment of the above invention. It is not something. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[0022]
【The invention's effect】
The present invention is implemented in the form described above, the crossbar portion connecting the contact holder portions of each pole is reinforced by a common mandrel, and the contact holder portion of each pole is provided integrally with the common mandrel. Since the two cores are reinforced by the arm mandrel and are integrally molded with an insulating material, a multipolar circuit breaker having high strength, good insulation performance, and easy manufacture can be provided.
[Brief description of the drawings]
FIG. 1 is a partial plan view including a movable side switching contact of a multipolar circuit breaker according to the present invention.
FIG. 2 is a perspective view of a mandrel provided inside a contact holding member included in FIG.
FIG. 3 is a cross-sectional view of only the contact holding member included in FIG. 1 as viewed from (a) AA and (b) BB.
FIG. 4 is a side cross-sectional view of a multipolar circuit breaker according to the present invention.
FIG. 5 is an external front view of the multipolar circuit breaker of FIG. 4;
FIG. 6 is a side sectional view of a conventional circuit breaker.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Contact holding member, 1a Cylindrical axis | shaft, 1b hole, hole in which 1c axis | shaft is inserted, 2 common mandrel, 3,4,5 arm mandrel, 4a hole, 6 case, 7,9 switching contact, 8 Fixed contact, 8a terminal, 10 flexible lead, 11 movable contact, 12 relay terminal, 13 terminal member, 14 shaft, 15 contact pressure spring, 16 frame, 16a arc-shaped recess, 17 handle lever, 17a arc-shaped end , 18 axis, 19 trip lever, 20 latch mechanism, 21 axis, 22 upper link plate, 23 axis, 24 lower link plate, 25 axis, 26 spring, 27 handle.

Claims (1)

Opening / closing contact provided for each pole, contact holder for holding the opening / closing contact, a cross bar for connecting the contact holder, and rotating the cross bar connected to any one of the pole portions of the contact holder In a multi-pole circuit breaker having a common switching mechanism to operate,
The crossbar and the contact holder are integrally formed members that are integrally molded by placing an insulating material so as to cover the mandrel, and the mandrel is arranged in the crossbar part. A common mandrel straddling a pole, and an arm mandrel provided integrally with the common mandrel and disposed on the contact holder portion ,
The arm mandrel is disposed to the poles of at least the contact holder in which the closing mechanism is connected, the opening and closing mechanism is characterized that you have been connected to the portion of the arm mandrel of the pole, multi-pole circuit breaker vessel.

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